Display panel or portion thereof with a graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with agraphical user interface showing a first embodiment of our design;

FIG. 2 is a front view of a display panel or portion thereof with agraphical user interface showing a second embodiment thereof;

FIG. 3 is a front view of a display panel or portion thereof with agraphical user interface showing a third embodiment thereof;

FIG. 4 is a front view of a display panel or portion thereof with agraphical user interface showing a fourth embodiment thereof;

FIG. 5 is a front view of a display panel or portion thereof with agraphical user interface showing a fifth embodiment thereof;

FIG. 6 is a front view of a display panel or portion thereof with agraphical user interface showing a sixth embodiment thereof;

FIG. 7 is a front view of a display panel or portion thereof with agraphical user interface showing a seventh embodiment thereof;

FIG. 8 is a front view of a display panel or portion thereof with agraphical user interface showing an eighth embodiment thereof; and,

FIG. 9 is a front view of a display panel or portion thereof with agraphical user interface showing a ninth embodiment thereof.

The outermost broken line rectangle illustrates a display panel orportion thereof that forms no part of the claimed design.

CLAIM The ornamental design for a display panel or portion thereof witha graphical user interface, as shown and described.